This first-order high pass filter is applicable to any operation requiring a dual power source. It was found in the March 1997 Electronics Now magazine.
In the figure we have a bistable multivibrator using an operational one. The circuit is from old...
This is another of the Star Trek red alert circuit that you can find on this site. We took this...
This circuit for testing zener diodes by lifting their curve on an oscilloscope was presented in...